Add strcpy and strncpy

libc/include/string.h

@@ -13,6 +13,9 @@ void* memmove(void*, const void*, size_t);
 void* memset(void*, int, size_t);
 size_t strlen(const char*);
 
+char* strcpy(char* __restrict, const char* __restrict);
+char* strncpy(char* __restrict, const char* __restrict, size_t);
+
 #ifdef __cplusplus
 }
 #endif